Java 之 POI各Jar包作用

　　目前POI的最新版本是 3.16-beta2，该版本是测试版本，稳定版本是 3.15，下载地址为 Apache POI  （http://poi.apache.org/download.html）。

一、目录结构

　　目录结构如下：

　　

　　

　　

二、详细介绍

　　官方地址：https://poi.apache.org/overview.html。

Maven artifactId	Prerequisites	JAR	Notes
poi-excelant	poi,poi-ooxml	poi-excelant-version.jar	用于读取表格、写入表格等一系列操作表格所用到的包

　　Component Map

　　The Apache POI distribution consists of support for many document file formats. This support is provided in several Jar files. Not all of the Jars are needed for every format. The following tables show the relationships between POI components, Maven repository tags, and the project's Jar files.

Component	Application type	Maven artifactId	Notes
POIFS	OLE2 Filesystem	poi	Required to work with OLE2 / POIFS based files
HPSF	OLE2 Property Sets	poi
HSSF	Excel XLS	poi	For HSSF only, if common SS is needed see below
HSLF	PowerPoint PPT	poi-scratchpad
HWPF	Word DOC	poi-scratchpad
HDGF	Visio VSD	poi-scratchpad
HPBF	Publisher PUB	poi-scratchpad
HSMF	Outlook MSG	poi-scratchpad
DDF	Escher common drawings	poi
HWMF	WMF drawings	poi-scratchpad
OpenXML4J	OOXML	poi-ooxml plus either poi-ooxml-schemas or ooxml-schemas and ooxml-security	See notes below for differences between these options
XSSF	Excel XLSX	poi-ooxml
XSLF	PowerPoint PPTX	poi-ooxml
XWPF	Word DOCX	poi-ooxml
XDGF	Visio VSDX	poi-ooxml
Common SL	PowerPoint PPT and PPTX	poi-scratchpad and poi-ooxml	SL code is in the core POI jar, but implementations are in poi-scratchpad and poi-ooxml.
Common SS	Excel XLS and XLSX	poi-ooxml	WorkbookFactory and friends all require poi-ooxml, not just core poi

　　This table maps artifacts into the jar file name. "version-yyyymmdd" is the POI version stamp. You can see what the latest stamp is on the downloads page.      

Maven artifactId	Prerequisites	JAR
poi	commons-logging, commons-codec, commons-collections, log4j	poi-version-yyyymmdd.jar
poi-scratchpad	poi	poi-scratchpad-version-yyyymmdd.jar
poi-ooxml	poi, poi-ooxml-schemas	poi-ooxml-version-yyyymmdd.jar
poi-ooxml-schemas	xmlbeans	poi-ooxml-schemas-version-yyyymmdd.jar
poi-examples	poi, poi-scratchpad, poi-ooxml	poi-examples-version-yyyymmdd.jar
ooxml-schemas	xmlbeans	ooxml-schemas-1.3.jar
ooxml-security	xmlbeans For signing: bcpkix-jdk15on, bcprov-jdk15on, xmlsec, slf4j-api	ooxml-security-1.1.jar

　　Note：Apache commons-collections4 was added as a dependency in POI 3.15 beta 3.      

　　poi-ooxml requires poi-ooxml-schemas. This is a substantially smaller version of the ooxml-schemas jar (ooxml-schemas-1.3.jar for POI 3.14 or later, ooxml-schemas-1.1.jar for POI 3.7 up to POI 3.13, ooxml-schemas-1.0.jar for POI 3.5 and 3.6). The larger ooxml-schemas jar is normally only required for development. Similarly, the ooxml-security jar, which contains all of the classes relating to encryption and signing, is normally only required for development. A subset of its contents are in poi-ooxml-schemas. This JAR is ooxml-security-1.1.jar for POI 3.14 onwards and ooxml-security-1.0.jar prior to that.

　　The OOXML jars require a stax implementation, but now that Apache POI requires Java 6, that dependency is provided by the JRE and no additional stax jars are required. The OOXML jars used to require DOM4J, but the code has now been changed to use JAXP and no additional dom4j jars are required. By the way, look at this FAQ if you have problems when using a non-Oracle JDK.

　　The ooxml schemas jars are compiled with Apache XMLBeans 2.3, and so can be used at runtime with any version of XMLBeans from 2.3 or newer. Wherever possible though, we recommend that you use XMLBeans 2.6.0 with Apache POI, and that is the version now shipped in the binary release packages.

　　总结：按照需要导入jar包及相关依赖jar包。

　　poi-3.15.jar  (excel文件生成需要)

　　poi-examples-3.15.jar(官方示例，开发不需要) 

　　poi-excelant-3.15.jar(不需要)

　　poi-ooxml-3.15.jar(excel,word,ppt均需要)

　　poi-ooxml-schemas-3.15.jar(excel需要)

　　poi-scratchpad-3.15.jar(ppt,vsd,word,viso,outlook等需要)